Decaf Coffee’s Hidden Chemical Risks | Generated by AI
Question: What does the Substack post at https://yinwang1.substack.com/p/8be say?
Answer:
The Substack post is written in Chinese by Yin Wang (王垠) and is titled 低咖啡因咖啡豆是怎么来的 (which translates to “How Decaffeinated Coffee Beans Are Made” or “Where Low-Caffeine Coffee Beans Come From”).
Publication date: February 5, 2024
Author: Yin Wang (on his newsletter “垠的备忘录” / Yin’s Memo)
The article expresses strong concerns about decaffeinated (decaf) coffee. The author explains that he avoids caffeinated drinks and also refuses to drink decaf coffee. His reason is that most decaf coffee beans are processed using organic solvents to remove caffeine, and he believes this leaves problematic chemical residues.
He references an article from The Conversation (https://theconversation.com/how-is-decaf-coffee-made-and-is-it-really-caffeine-free-215546) and describes the two main decaffeination methods, focusing especially on the solvent-based approach.
Key points from the post:
- There are two primary ways to remove caffeine, but the solvent method (using organic solvents) is the most common because it is cheaper.
- The solvent method has two variants: direct and indirect.
Direct solvent method (described in detail):
- Coffee beans are first steamed.
- Then they are soaked in dichloromethane (methylene chloride) or ethyl acetate to dissolve the caffeine.
- After soaking, the beans are steamed again to remove the residual solvent.
The author questions whether this second steaming step can truly eliminate all traces of the solvent. He doubts it, arguing that:
- These are volatile compounds, but they have been soaked into the beans for a long time.
- It’s uncertain whether the solvents fully evaporate, whether they bind chemically with components in the coffee bean, or whether they become trapped inside the bean structure.
The post appears to be paywalled (marked as “Paid”), so the publicly visible portion ends around this skeptical remark about the direct method and residual chemicals. The full article likely continues to discuss the indirect solvent method, possibly the Swiss Water Process or CO₂ method (as safer alternatives), and explains why the author still avoids decaf entirely.
Overall message: The author is highly suspicious of conventional decaf coffee due to potential chemical contamination from the solvent extraction process and recommends avoiding it.
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